CN105406496A - Isolated microgrid frequency modulation control method based on measured frequency response identification - Google Patents

Isolated microgrid frequency modulation control method based on measured frequency response identification Download PDF

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CN105406496A
CN105406496A CN201510929969.1A CN201510929969A CN105406496A CN 105406496 A CN105406496 A CN 105406496A CN 201510929969 A CN201510929969 A CN 201510929969A CN 105406496 A CN105406496 A CN 105406496A
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frequency
urgent
micro
freq
capacitance sensor
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CN105406496B (en
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孙晓彦
时伯年
孙刚
刘志超
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Beijing Sifang Automation Co Ltd
Beijing Sifang Engineering Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/14—District level solutions, i.e. local energy networks

Abstract

The invention discloses an isolated microgrid frequency modulation control method based on measured frequency response identification. The method provides a frequency modulation control strategy aiming at the operation features of an isolated microgrid and based on a principle of segmented frequency modulation control. According to the control strategy, the emergency degrees of the frequency modulation control are graded according to the frequency deviations of the microgrid, different active power control modes are used in different control areas; control parameters based on the measured frequency response identification are used, and thereby renewable energy sources can be maximally used for generating power, meanwhile the charging and discharging times of an energy storage battery are reduced, and an oscillation problem due to the fact that power modulation speeds are inconsistent is avoided. When disturbance occurs, the strategy can support the frequency of the microgrid, and improve the stability of the frequency of the microgrid.

Description

A kind of isolated micro-capacitance sensor frequency modulation control method based on practical frequency response identification
Technical field
The invention belongs to electric power system micro-capacitance sensor technical field, be specifically related to a kind of isolated micro-capacitance sensor frequency modulation control method based on practical frequency response identification.
Background technology
Large-scale application based on the distributed power generation of regenerative resource is one of most effective solution of the low carbonization of future electrical energy industrial realization.Renewable energy power generation technology is pollution-free with it, renewable, distribute the advantage such as wide, receives increasing concern.But renewable energy power generation has the advantages that fluctuation is large, randomness is strong.Therefore, configure the energy-storage system of certain capacity on the spot, effectively can suppress the fluctuation of renewable energy power generation power output, improve the ability that electrical network receives renewable energy power generation.
Energy-storage system is as the important component part of micro-capacitance sensor, by electric energy access fast, the power in micro-capacitance sensor can be effectively regulated to distribute, electric energy supply and demand in balance micro-capacitance sensor, participates in the frequency adjustment of system, improves custom power quality, improve micro-capacitance sensor to the adaptibility to response of accident, for micro-capacitance sensor more distributed power sources of dissolving provide safeguard, therefore, in micro-capacitance sensor, the correlative study of energy-storage system has become a focus of attention in this field.
During micro-capacitance sensor isolated operation, owing to lacking the power support of upstream distribution system, when its inner intermittent distributed power source exerts oneself generation random fluctuation, can there is larger skew in micro-capacitance sensor frequency, have a strong impact on custom power quality.Therefore, compared with micro-grid connection running status, isolated micro-capacitance sensor is stronger to the dependence of energy-storage system from Running State, and the related request such as fail safe, reliability run energy-storage system is also higher.
Energy-storage battery is comparatively large by discharge and recharge times influence for useful life, frequently should not carry out discharge and recharge operation, so energy storage should not carry out real-time indifference frequency modulation.When rotating class power supply containing water power, Chai Fa etc. in micro-capacitance sensor, this type of power supply should as main power source, and accumulation power supply assists main power source to carry out temporary emergency frequency modulation usually when system frequency abnormality.
Less about the investigation and application of the urgent frequency modulation control of energy storage at present, mainly use the urgent frequency modulation control method based on pid algorithm.The method can give full play to energy storage in the urgent frequency modulation of the energy storage stage of dropping into and respond fast advantage.But exit the stage at the urgent frequency modulation of energy storage, rotate class main power source and there is comparatively Great inertia, frequency modulation speed is slow, and energy storage inverter belongs to power electronic equipment, action is very fast, the speed that energy-storage system exits the stage at frequency modulation if the two governing speed is inconsistent, in adjustment process, easily occurs that system frequency is vibrated, so must match with main power source governing speed.Although more existing researchs adopt low-pass filtering algorithm to improve the matching performance with main power source frequency modulation speed in the urgent frequency modulation of the energy storage stage of exiting, the formulation of controling parameters lacks effective method.
Summary of the invention
In order to overcome the deficiency that the urgent frequency modulation control method of existing micro-grid energy storage system exists, the present invention proposes a kind of isolated micro-capacitance sensor control method for frequency based on practical frequency response identification.
The present invention is concrete by the following technical solutions.
Based on an isolated micro-capacitance sensor frequency modulation control method for practical frequency response identification, it is characterized in that, described method comprises following steps:
(1) according to micro-capacitance sensor frequency departure, frequency modulation control area is divided, be divided into dead band, secondary urgent district and urgent district; The frequency threshold in setting time urgent district and urgent district is respectively Freq secondary urgent lower limit, Freq the secondary urgent upper limitand Freq urgent lower limit, Freq the urgent upper limit;
(2) the system frequency Freq of current time micro-capacitance sensor is monitored now:
Work as Freq secondary urgent lower limit< Freq now< Freq the secondary urgent upper limittime, micro-capacitance sensor is in the dead band of frequency modulation control, without the need to carrying out frequency modulation control to isolated micro-capacitance sensor;
Work as Freq the secondary urgent upper limit≤ Freq now< Freq the urgent upper limitor Freq urgent lower limit< Freq now≤ Freq secondary urgent lower limittime, micro-capacitance sensor is in time urgent district of frequency modulation control, and frequency modulation task is born by rotating class main power source;
Work as Freq now>=Freq the urgent upper limitor Freq now≤ Freq urgent lower limittime, micro-capacitance sensor is in the urgent district of frequency modulation control, and energy-storage system drops into urgent frequency modulation function, and the auxiliary class main power source that rotates carries out frequency modulation jointly;
(3) as the system frequency Freq of micro-capacitance sensor nowwhen entering secondary urgent district by dead band, frequency modulation control is completed according to unit primary frequency modulation characteristic by all speed regulators with the rotation class main power source of variable capacity in micro-capacitance sensor;
(4) as the system frequency Freq of micro-capacitance sensor nowwhen entering urgent district by secondary urgent district, rotate class main power source regulates micro-capacitance sensor system frequency according to unit primary frequency modulation characteristic, energy-storage system drops into urgent frequency modulation function, adopts pid algorithm Quick to support for meritorious;
(5) as the system frequency Freq of micro-capacitance sensor nowwhen entering secondary urgent district by urgent district, rotate class main power source regulates micro-capacitance sensor system frequency according to unit primary frequency modulation characteristic, energy-storage system employing is simulated generator inertia mode of frequency regulation and is exited urgent frequency modulation function gradually.
The present invention preferably includes following scheme further:
In step (4), energy-storage system is using the threshold value in urgent district as frequency reference, and frequency is upwards out-of-limit, and reference value gets Freq the urgent upper limit, frequency is out-of-limit downwards, and reference value gets Freq urgent lower limit, by the threshold value in urgent district and ongoing frequency Freq nowbe poor Δ f; Then after PID link, meritorious variation delta P is obtained; Finally Δ P and current energy storage there is work value P csummation, and consider that the limit value of energy-storage system active power increases the bound that namely amplitude limiting controller arranges the exportable active power of energy-storage system, then export according to higher limit higher than the upper limit, then export according to lower limit lower than lower limit, not out-of-limit then according to the output of Practical Calculation value, thus the total active-power P exported when drawing energy-storage system frequency modulation.
In step (5), the urgent frequency modulation of energy-storage system exits and adopts simulation generator inertia mode of frequency regulation, becomes time constant to be T energy-storage system equivalence bfirst order inertial loop be multiplied by gain K bmodel, in the model, T bby the time constant of the simulation generator amature equation of motion, first order inertial loop is for describing the time delay of energy-storage system power supply; K bby the inverse of active power-frequency droop coefficient of simulation generator, the relation of the changes delta P ' that exerts oneself for analogue system frequency deviation f ' and accumulation power supply; Concrete grammar is: using the threshold value in urgent district as frequency reference, and frequency is upwards out-of-limit, and reference value gets Freq the urgent upper limit, frequency is out-of-limit downwards, and reference value gets Freq urgent lower limitas with reference to value, by the threshold value in urgent district and ongoing frequency Freq nowbe poor Δ f '; Then through type (1) obtains meritorious variation delta P '; Finally Δ P ' and current energy storage there is work value P csummation, and consider that the limit value of energy storage active power increases the bound that namely amplitude limiting controller arranges the exportable active power of energy-storage system, then export according to higher limit higher than the upper limit, then export according to lower limit lower than lower limit, not out-of-limit then according to the output of Practical Calculation value, thus the total active-power P exported when drawing energy storage frequency modulation.
&Delta;P &prime; = &Delta;f &prime; &times; K b T b s + 1 - - - ( 1 )
In step (5), exit the stage at the urgent frequency modulation of energy-storage system, active power input in frequency modulation is transferred to when rotating class main power source and must matches with rotation class main power source governing speed by energy-storage system, therefore T bround the equivalent inertia time constant H of a micro-capacitance sensor, and by the unbalanced power amount of actual measurement and the equivalent inertia time constant H of frequency change rate calculating micro-capacitance sensor; Concrete grammar is:
1. with reference to the equation of rotor motion of synchronous generator, in micro-capacitance sensor, set up equivalent inertia time constant, describe the overall equivalent inertia time constant of micro-capacitance sensor, shown in (2):
Wherein, H is equivalent inertia time constant in micro-capacitance sensor, P gfor the active power that power supply in micro-capacitance sensor sends, P lfor the active power that micro-capacitance sensor internal burden consumes, f nfor work frequency, df/dt is system frequency rate of change, Δ P unevenfor the active power amount of unbalance of whole micro-capacitance sensor;
2. the active-power P that in Real-time Collection micro-capacitance sensor, all power supplys send gwith load P l, and micro-grid system frequency f.
3., when detecting that micro-grid system frequency change is out-of-limit, getting the frequency change rate out-of-limit moment is that moment t occurs in disturbance 0, t 0front M second is moment t before disturbance 1, t 0rear N second is moment t after disturbance 2, record t 1the P in moment g1, P l1, record t 0the P in moment g0, P l0, f 0, record t 2the f in moment 2;
4. according to formula Δ P uneven=(P g0-P l0)-(P g1-P l1) rated output amount of unbalance Δ P uneven;
5. according to formula calculated rate rate of change df/dt.
6. according to formula calculate micro-capacitance sensor equivalence inertia time constant H.
The present invention has following useful technique effect:
Based on practical frequency response identification controling parameters, thus avoid each power adjustment speed inconsistent oscillation problem caused when the urgent frequency modulation of energy-storage system exits.
Accompanying drawing explanation
Figure 1 shows that frequency modulation control region and control mode schematic diagram;
Figure 2 shows that the urgent frequency modulation of energy storage drops into the pid algorithm control block diagram adopted;
Figure 3 shows that the urgent frequency modulation of energy storage exits the simulation generator inertia mode of frequency regulation control block diagram of employing;
Figure 4 shows that urgent district frequency modulation simulation result figure;
Figure 5 shows that identification micro-capacitance sensor equivalence inertia time constant algorithm flow chart.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is stated further in detail.
A kind of isolated micro-capacitance sensor frequency modulation control method based on practical frequency response identification disclosed by the invention, comprises the following steps:
Step 1, as shown in Figure 1, divides frequency modulation control area according to micro-capacitance sensor frequency departure, is divided into dead band, secondary urgent district and urgent district.Setpoint frequency time urgent lower limit is 49.97Hz, and the frequency time urgent upper limit is 50.03Hz, and the urgent lower limit of frequency is 49Hz, and the urgent upper limit of frequency is 51Hz.As shown in table 1:
Table 1 frequency threshold is arranged
Step 2, supervision current time system frequency Freq now.As 49.97Hz < Freq nowduring < 50.03Hz, micro-capacitance sensor is in the dead band of frequency modulation control, and system frequency deviation is little, without the need to carrying out frequency modulation control.As 50.03Hz≤Freq now< 51Hz or 49Hz < Freq nowduring≤49.97Hz, micro-capacitance sensor is in time urgent district of frequency modulation control, and frequency modulation task is born by rotating class main power source (water power, Chai Fa etc.).Work as Freq now>=51Hz or Freq nowduring≤49Hz, micro-capacitance sensor is in the urgent district of frequency modulation control, and energy-storage system drops into urgent frequency modulation function, and the auxiliary class main power source that rotates carries out frequency modulation jointly.
Step 3, system frequency Freq nowwhen entering secondary urgent district by dead band, frequency modulation control is completed according to unit primary frequency modulation characteristic by all speed regulators with the rotation class main power source of variable capacity in micro-capacitance sensor.
Step 4, system frequency Freq nowwhen entering urgent district by secondary urgent district, main power source is according to unit primary frequency modulation characteristic regulating system frequency, and energy-storage system drops into urgent frequency modulation function, adopts pid algorithm Quick to support for meritorious.
Be illustrated in figure 2 the urgent frequency modulation of energy storage and drop into the pid algorithm control block diagram adopted.Pid algorithm is specially, and using the threshold value in urgent district, as frequency reference, (frequency is upwards out-of-limit, and reference value gets Freq the urgent upper limit, frequency is out-of-limit downwards, and reference value gets Freq urgent lower limit), with ongoing frequency Freq nowbe poor Δ f; Then after PID link, meritorious variation delta P is obtained; Finally Δ P and current energy storage there is work value P csummation, and consider that the limit value of energy storage active power increases amplitude limiting controller and (namely arranges the bound of the exportable active power of energy-storage system, then export according to higher limit higher than the upper limit, then export according to lower limit lower than lower limit, not out-of-limit then according to the output of Practical Calculation value), thus the total active-power P exported when drawing energy storage frequency modulation.
Step 5, system frequency Freq nowwhen entering secondary urgent district by urgent district, main power source is according to unit primary frequency modulation characteristic regulating system frequency, and energy-storage system adopts simulation generator inertia mode of frequency regulation to exit urgent frequency modulation function gradually.
Be illustrated in figure 3 the simulation generator inertia mode of frequency regulation control block diagram that the urgent frequency modulation of energy storage exits employing.Concrete grammar is: using the threshold value in urgent district, as frequency reference, (frequency is upwards out-of-limit, and reference value gets Freq the urgent upper limit, frequency is out-of-limit downwards, and reference value gets Freq urgent lower limit), with ongoing frequency Freq nowbe poor Δ f '; Then through type obtain meritorious variation delta P '; Finally Δ P ' and current energy storage there is work value P csummation, and consider that the limit value of energy storage active power increases amplitude limiting controller, thus the total active-power P exported when drawing energy storage frequency modulation.
Exit the stage at the urgent frequency modulation of energy-storage system, active power input in frequency modulation is transferred to when rotating class main power source and must matches with rotation class main power source governing speed by energy-storage system, therefore T bround the equivalent inertia time constant H of a micro-capacitance sensor, and pass through unbalanced power amount and the frequency change rate calculating of actual measurement; Concrete grammar is as shown in Figure 5:
(1) equivalent equation of rotor motion is set up
Wherein, H is equivalent inertia time constant in micro-capacitance sensor, P gwhat send for power supply in micro-capacitance sensor gains merit, P lfor the active power that micro-capacitance sensor internal burden consumes, f nfor work frequency, df/dt is system frequency rate of change, Δ P unevenfor the active power amount of unbalance of whole micro-capacitance sensor.
(2) active-power P that in Real-time Collection micro-capacitance sensor, all power supplys send gwith load P l, and micro-grid system frequency f.
(3) when detecting that micro-grid system frequency change is out-of-limit, getting the frequency change rate out-of-limit moment is that moment t occurs in disturbance 0, t 0within first 1 second, be moment t before disturbance 1, t 0within latter 0.1 second, be moment t after disturbance 2.Record t 1the P in moment g1, P l1, record t 0the P in moment g0, P l0, f 0, record t 2the f in moment 2.
(4) according to formula Δ P uneven=(P g0-P l0)-(P g1-P l1) rated output amount of unbalance Δ P uneven.
(5) according to formula calculated rate rate of change df/dt.
(6) according to formula calculate electrical network equivalence inertia time constant H.
Figure 4 shows that urgent district frequency modulation simulation result figure.After system frequency declines, accumulation power supply and Hydropower Unit export has increase, the power shortage of their shared systems.Wherein, accumulation power supply can support for active power by Quick, and the active power response of the hydraulic turbine is slower.When system frequency returns to more than 49Hz, energy storage is exited gradually because of exerting oneself of increasing of frequency modulation, is transferred to Hydropower Unit.The urgent frequency modulation of energy-storage system exits algorithm, owing to have employed the controling parameters based on practical frequency response identification, improves and the matching performance rotating class power supply frequency modulation speed, avoids hunting of frequency, thus the safe and stable operation of the strong system that ensure that.

Claims (4)

1., based on an isolated micro-capacitance sensor frequency modulation control method for practical frequency response identification, it is characterized in that, described method comprises following steps:
(1) according to micro-capacitance sensor frequency departure, frequency modulation control area is divided, be divided into dead band, secondary urgent district and urgent district; The frequency threshold in setting time urgent district and urgent district is respectively Freq secondary urgent lower limit, Freq the secondary urgent upper limitand Freq urgent lower limit, Freq the urgent upper limit;
(2) the system frequency Freq of current time micro-capacitance sensor is monitored now:
Work as Freq secondary urgent lower limit< Freq now< Freq the secondary urgent upper limittime, micro-capacitance sensor is in the dead band of frequency modulation control, without the need to carrying out frequency modulation control to isolated micro-capacitance sensor;
Work as Freq the secondary urgent upper limit≤ Freq now< Freq the urgent upper limitor Freq urgent lower limit< Freq now≤ Freq secondary urgent lower limittime, micro-capacitance sensor is in time urgent district of frequency modulation control, and frequency modulation task is born by rotating class main power source;
Work as Freq now>=Freq the urgent upper limitor Freq now≤ Freq urgent lower limittime, micro-capacitance sensor is in the urgent district of frequency modulation control, and energy-storage system drops into urgent frequency modulation function, and the auxiliary class main power source that rotates carries out frequency modulation jointly;
(3) as the system frequency Freq of micro-capacitance sensor nowwhen entering secondary urgent district by dead band, frequency modulation control is completed according to unit primary frequency modulation characteristic by all speed regulators with the rotation class main power source of variable capacity in micro-capacitance sensor;
(4) as the system frequency Freq of micro-capacitance sensor nowwhen entering urgent district by secondary urgent district, rotate class main power source regulates micro-capacitance sensor system frequency according to unit primary frequency modulation characteristic, energy-storage system drops into urgent frequency modulation function, adopts pid algorithm Quick to support for meritorious;
(5) as the system frequency Freq of micro-capacitance sensor nowwhen entering secondary urgent district by urgent district, rotate class main power source regulates micro-capacitance sensor system frequency according to unit primary frequency modulation characteristic, energy-storage system employing is simulated generator inertia mode of frequency regulation and is exited urgent frequency modulation function gradually.
2. isolated micro-capacitance sensor frequency modulation control method according to claim 1, is characterized in that:
In step (4), energy-storage system is using the threshold value in urgent district as frequency reference, and frequency is upwards out-of-limit, and frequency reference gets Freq the urgent upper limit, frequency is out-of-limit downwards, and frequency reference gets Freq urgent lower limit, by the threshold value in urgent district and ongoing frequency Freq nowbe poor Δ f; Then after PID link, meritorious variation delta P is obtained; Finally Δ P and current energy storage there is work value P csummation, and consider that the limit value of energy-storage system active power increases the bound that namely amplitude limiting controller arranges the exportable active power of energy-storage system, then export according to higher limit higher than the upper limit, then export according to lower limit lower than lower limit, not out-of-limit then according to the output of Practical Calculation value, thus the total active-power P exported when drawing energy-storage system frequency modulation.
3. isolated micro-capacitance sensor frequency modulation control method according to claim 1, is characterized in that:
In step (5), the urgent frequency modulation of energy-storage system exits and adopts simulation generator inertia mode of frequency regulation, becomes time constant to be T energy-storage system equivalence bfirst order inertial loop be multiplied by gain K bmodel, in the model, T bby the time constant of the simulation generator amature equation of motion, first order inertial loop is for describing the time delay of energy-storage system power supply; K bby the inverse of active power-frequency droop coefficient of simulation generator, the relation of the changes delta P ' that exerts oneself for analogue system frequency deviation f ' and accumulation power supply; Concrete grammar is: using the threshold value in urgent district as frequency reference, and frequency is upwards out-of-limit, and frequency reference gets Freq the urgent upper limit, frequency is out-of-limit downwards, and frequency reference gets Freq urgent lower limitas with reference to value, by the threshold value in urgent district and ongoing frequency Freq nowbe poor Δ f '; Then through type (1) obtains meritorious variation delta P '; Finally Δ P ' and current energy storage there is work value P csummation, and consider that the limit value of energy storage active power increases the bound that namely amplitude limiting controller arranges the exportable active power of energy-storage system, then export according to higher limit higher than the upper limit, then export according to lower limit lower than lower limit, not out-of-limit then according to the output of Practical Calculation value, thus the total active-power P exported when drawing energy storage frequency modulation.
&Delta;P &prime; = &Delta;f &prime; &times; K b T b s + 1 - - - ( 1 )
4. isolated micro-capacitance sensor frequency modulation control method according to claim 3, is characterized in that:
Exit the stage at the urgent frequency modulation of energy-storage system, active power input in frequency modulation is transferred to when rotating class main power source and must matches with rotation class main power source governing speed by energy-storage system, therefore T bround the equivalent inertia time constant H of a micro-capacitance sensor, and pass through unbalanced power amount and the frequency change rate calculating of actual measurement; Concrete grammar is:
1. with reference to the equation of rotor motion of synchronous generator, in micro-capacitance sensor, set up equivalent inertia time constant, describe the overall equivalent inertia time constant of micro-capacitance sensor, shown in (2):
Wherein, H is equivalent inertia time constant in micro-capacitance sensor, P gfor the active power that power supply in micro-capacitance sensor sends, P lfor the active power that micro-capacitance sensor internal burden consumes, f nfor work frequency, df/dt is system frequency rate of change, Δ P unevenfor the active power amount of unbalance of whole micro-capacitance sensor;
2. the active-power P that in Real-time Collection micro-capacitance sensor, all power supplys send gwith load P l, and micro-grid system frequency f.
3., when detecting that micro-grid system frequency change is out-of-limit, getting the frequency change rate out-of-limit moment is that moment t occurs in disturbance 0, t 0front M second is moment t before disturbance 1, t 0rear N second is moment t after disturbance 2, record t 1the P in moment g1, P l1, record t 0the P in moment g0, P l0, f 0, record t 2the f in moment 2;
4. according to formula Δ P uneven=(P g0-P l0)-(P g1-P l1) rated output amount of unbalance Δ P uneven;
5. according to formula calculated rate rate of change df/dt.
6. according to formula calculate micro-capacitance sensor equivalence inertia time constant H.
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CN110556844A (en) * 2019-09-29 2019-12-10 云南电网有限责任公司电力科学研究院 automatic frequency modulation method for asynchronous transmitting-end power grid
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CN107465203B (en) * 2017-09-19 2019-06-25 国网湖南省电力公司 A kind of adaptive cooperation method of power grid frequency modulation mode
CN109802413A (en) * 2017-11-17 2019-05-24 中国电力科学研究院有限公司 It is a kind of actively to support mains frequency response control mehtod and system
CN109802413B (en) * 2017-11-17 2022-10-04 中国电力科学研究院有限公司 Active support power grid frequency response control method and system
CN109193701A (en) * 2018-10-15 2019-01-11 国网河南省电力公司电力科学研究院 Electric system low-limit frequency calculation method and device under high-power missing
CN110556844A (en) * 2019-09-29 2019-12-10 云南电网有限责任公司电力科学研究院 automatic frequency modulation method for asynchronous transmitting-end power grid
CN110867873A (en) * 2019-11-15 2020-03-06 上海电器科学研究所（集团）有限公司 Frequency control method for ocean island microgrid
CN110867873B (en) * 2019-11-15 2023-10-17 上海电器科学研究所（集团）有限公司 Ocean island micro-grid frequency control method
CN113032377A (en) * 2020-12-03 2021-06-25 万克能源科技有限公司 Independent micro-grid operation control method formed by energy storage and micro gas turbine
CN112542843A (en) * 2020-12-11 2021-03-23 南京南瑞继保工程技术有限公司 Independent micro-grid rapid frequency modulation method
CN112542843B (en) * 2020-12-11 2022-08-26 南京南瑞继保工程技术有限公司 Independent micro-grid rapid frequency modulation method
CN114188996A (en) * 2021-12-06 2022-03-15 国网湖南省电力有限公司 Electrochemical energy storage power station active control method, system and medium adapting to frequency modulation function

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